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Controlling fan speed and hard drive APM settings on Synology DiskStation

There is a file in /usr/syno/etc/scemd.xml which controls the fan speeds and trigger temperatures corresponding to the setting at Control Panel > Power, as well as drive APM settings (for hard drive head parking issues. More information for this issue can be found by reading this post). Feel free to edit the file to your needs, but remember that settings may not be preserved during DSM updates.

On my DS211j running DSM 4.1-2668 the file contains the following:

<?xml version="1.0" encoding="UTF-8"?>
<scemd>
 <fan_config period="20" threshold="6" type="DUAL_MODE_HIGH" hibernation_speed="STOP">
 <disk_temperature fan_speed="ULTRA_LOW" action="NONE">0</disk_temperature>
 <disk_temperature fan_speed="VERY_LOW" action="NONE">52</disk_temperature>
 <disk_temperature fan_speed="LOW" action="NONE">54</disk_temperature>
 <disk_temperature fan_speed="ULTRA_HIGH" action="NONE">58</disk_temperature>
 <disk_temperature fan_speed="FULL" action="SHUTDOWN">61</disk_temperature>
 </fan_config>
 <fan_config period="20" threshold="6" type="DUAL_MODE_LOW" hibernation_speed="STOP">
 <disk_temperature fan_speed="STOP" action="NONE">0</disk_temperature>
 <disk_temperature fan_speed="ULTRA_LOW" action="NONE">40</disk_temperature>
 <disk_temperature fan_speed="VERY_LOW" action="NONE">52</disk_temperature>
 <disk_temperature fan_speed="LOW" action="NONE">54</disk_temperature>
 <disk_temperature fan_speed="ULTRA_HIGH" action="NONE">58</disk_temperature>
 <disk_temperature fan_speed="FULL" action="SHUTDOWN">61</disk_temperature>
 </fan_config>

<fan_config hw_version="Synology-DX5" period="20" threshold="6" type="DUAL_MODE_HIGH_EBOX" hibernation_speed="UNKNOWN">
 <disk_temperature fan_speed="FULL" action="NONE">0</disk_temperature>
 <disk_temperature fan_speed="FULL" action="NONE">45</disk_temperature>
 <disk_temperature fan_speed="FULL" action="NONE">55</disk_temperature>
 <disk_temperature fan_speed="FULL" action="SHUTDOWN">61</disk_temperature>
</fan_config>

<fan_config hw_version="Synology-DX5" period="20" threshold="6" type="DUAL_MODE_LOW_EBOX" hibernation_speed="UNKNOWN">
 <disk_temperature fan_speed="FULL" action="NONE">0</disk_temperature>
 <disk_temperature fan_speed="FULL" action="NONE">45</disk_temperature>
 <disk_temperature fan_speed="FULL" action="NONE">55</disk_temperature>
 <disk_temperature fan_speed="FULL" action="SHUTDOWN">61</disk_temperature>
</fan_config>

<fan_config hw_version="Synology-DX510" period="20" threshold="6" type="DUAL_MODE_HIGH_EBOX" hibernation_speed="LOW">
 <disk_temperature fan_speed="MIDDLE" action="NONE">0</disk_temperature>
 <disk_temperature fan_speed="HIGH" action="NONE">48</disk_temperature>
 <disk_temperature fan_speed="FULL" action="SHUTDOWN">61</disk_temperature>
</fan_config>

<fan_config hw_version="Synology-DX510" period="20" threshold="6" type="DUAL_MODE_LOW_EBOX" hibernation_speed="LOW">
 <disk_temperature fan_speed="MIDDLE" action="NONE">0</disk_temperature>
 <disk_temperature fan_speed="HIGH" action="NONE">48</disk_temperature>
 <disk_temperature fan_speed="FULL" action="SHUTDOWN">61</disk_temperature>
</fan_config>
<disk_control>
 <disk model="ST9120821A">APM_255</disk>
 <disk model="HTS722020K9SA00">APM_255</disk>
 <disk model="ST980811AS">APM_255</disk>
 <disk model="MHV2060BH">APM_255</disk>
 <disk model="MK6034GSX">APM_254</disk>
 <disk model="ST9100824AS">APM_255</disk>
 <disk model="HM250JI">APM_255</disk>
 <disk model="MK1637GSX">APM_254</disk>
 <disk model="ST9100824AS">APM_255</disk>
 <disk model="ST9120822AS">APM_254</disk>
 <disk model="ST9160821AS">APM_254</disk>
 <disk model="WD2500BEVS-75UST0">APM_254</disk>
 <disk model="HM250JI">APM_254</disk>
 <disk model="WD2500BEVS">APM_254</disk>
 <disk model="WD1600BEVT">APM_255</disk>
 <disk model="HTS543232L9A300">APM_255</disk>
 <disk model="WD1600BEVE">APM_255</disk>
 <disk model="MK2546GSX">APM_254</disk>
 <disk model="MHV2080BHPL">APM_255</disk>
 <disk model="WD1200BEVE">APM_255</disk>
 <disk model="HTS543225L9A300">APM_255</disk>
 <disk model="WD3200BEVT">APM_254</disk>
 <disk model="MK8025GAS">APM_254</disk>
 <disk model="ST9200420AS">APM_254</disk>
 <disk model="WD3200BEVT">APM_254</disk>
 <disk model="HTS543216L9SA00">APM_254</disk>
 <disk model="MK4058GSX">APM_254</disk>
 <disk model="WD6400BEVT">APM_254</disk>
 <disk model="ST32000542AS">APM_255</disk>
 <disk model="ST95005620AS">APM_255</disk>
</disk_control>

</scemd>
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